On September 11, the Orthodox Church celebrates the Beheading of John the Baptist.
In the folk calendar, September 11 is Ivan the Faster, Golovosek, Ivan the Proletok, Poletny, Poletovshchik, Ivan the Autumn Marketplace, Ivan the Dry, and Turnip Festival.
According to folk signs on Ivan Postny, you can determine whether the autumn will be warm and long.
Thunder on this day means that autumn will be warm.
If swans and geese start flying away, it will soon get colder.
If the cranes haven't flown away yet, autumn will last a long time.
If there are a lot of acorns on the oak trees, there will be a lot of snow before Christmas.